can the microwave be attached from above somehow? might take a little ingenuity but it's better than falling off. maybe look at reinforcing the back panel from behind and then screwing into that.

of course it can be attached from above, that is how they hang from the cabinet. bolts screw down from the upper cabinet into the micro. His problem is the rear support that needs to screw into studs will be screwed into nothing but a 1/4" piece of backer board. Not really an ideal install.

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__________________
................."I want a house that has gotten over all its troubles. I dont' want to spend the rest of life bringing up a young and inexperienced house"...........

ok here is what I would do. Since you said you don't mind the toggle bolts going through the back panel, why not take a piece of 1/2" plywood. Cut it the exact same dimensions as your micro wave back. Screw it to the backer panel from the opposite side of the micro with about 6 or 8 black headed screws. That way you have a good solid backing to screw you support to.

__________________
................."I want a house that has gotten over all its troubles. I dont' want to spend the rest of life bringing up a young and inexperienced house"...........

ok here is what I would do. Since you said you don't mind the toggle bolts going through the back panel, why not take a piece of 1/2" plywood. Cut it the exact same dimensions as your micro wave back. Screw it to the backer panel from the opposite side of the micro with about 6 or 8 black headed screws. That way you have a good solid backing to screw you support to.

I would screw through the panel into the ply.
Again,MW will hide any screws AND more of the screw is grabbing the ply and not the panel.
Oh,and the MW doesn't hang from the cabnet.
It is bolted to it.

Thanks for all the advice so far hardwareman - i like your idea with a sheet of plywood accross the back with the MW bracket. What do you think about using hurricane ties and attaching them into the side cabinets for additional support/stregnth.